Which scientist(s) figured out that the shape of a DNA molecule is a double helix? a. Hershey and Chase
b. Griffith
c. Watson and Crick
d. Franklin

Natalie had random hand movements when she was two months old. when she was six months old, she used to grab a block with her whole hand. now at the age of ten months, she can grasp the same block with her thumb and forefinger. this sequence of growth in her hand and finger movements is according to the pattern.

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

How does human environment effect the biosphere